초록 ▼

A rotary valve for fluid flow control is provided having curved sealing surfaces, at least one of which has a cross-sectional arc segment forming a portion of an involute, for a valve closure member and a fluid port valve seat or seating surface. By machining the sealing surfaces of the valve closur

A rotary valve for fluid flow control is provided having curved sealing surfaces, at least one of which has a cross-sectional arc segment forming a portion of an involute, for a valve closure member and a fluid port valve seat or seating surface. By machining the sealing surfaces of the valve closure member and of the valve seat to the form of an involute, these surfaces will engage substantially simultaneously over the entire perimeter of the valve seat at initial closing contact and closed or sealed positions. After initial contact and during overclosure, if elastomeric surfaces are used, the compression and sealing of resilient seating material will be uniform over the entire engaging surface, and around the periphery of the valve seat.

대표청구항 ▼

Rotary valve means for controlling fluid flow therethrough, comprising: valve housing means having fluid passageway therethrough; valve closure member movably supported in said valve housing means about a pivotal axis and having a shaped sealing surface; and valve seat surface means within said valv

Rotary valve means for controlling fluid flow therethrough, comprising: valve housing means having fluid passageway therethrough; valve closure member movably supported in said valve housing means about a pivotal axis and having a shaped sealing surface; and valve seat surface means within said valve housing means for engagement with said shaped sealing surface of said valve closure member to restrict fluid flow through said fluid passageway means, said valve seat surface means having, with respect to a plane perpendicular to said pivotal axis, an arc segment forming a sufficient portion of an involute so as to not form a portion of an eccentrically mounted circle such that the sealing portions of said shaped sealing surface and said valve seat surface means engage substantially simultaneously upon closure of said rotary valve means.